62results about How to "Mild and controllable reaction" patented technology

The invention relates to the technical field of fluorine chemical industry, in particular to a method for comprehensive utilization of a solvent and by-products in preparation of HFPO through an oxygen oxidation process. According to the comprehensive utilization method, a to-be-purified fluorocarbon solvent containing acyl fluoride by-products generated in the preparation of the HFPO through theoxygen oxidation process is sequentially subjected to separation, alcohol washing, rectification, alkali washing and drying to obtain the fluorocarbon solvent with a purity of 99wt% or above. The method is simple in process route; an important fluorination reagent in the fluorine chemical industry can be obtained; the fluorocarbon solvent can be continuously used in the reaction for preparing HFPOafter being purified; and more importantly, the byproducts are converted into stable and neutral esters rather than carboxylic acids, and can be applied or converted in a wider scope, so the purposeof comprehensive utilization of all the byproducts is achieved.

The invention discloses a process for preparing graphene by a cryochemical method, belonging to the technical field of chemical synthesis of graphene. The process uses graphene oxide prepared by chemical oxidation as a raw material, and comprises the step of reducing reaction in which graphene oxide is reduced into graphene. The reducing reaction step implements reduction of the graphene oxide at80-150 DEG C by using sodium borohydride as a reducer by the aid of a catalyst, oxygen-containing functional groups (epoxy group, hydroxy group, carboxy group and carbonyl group) on the graphene oxide are removed, and the electric conductivity of the graphene is thoroughly recovered, thereby preparing the graphene. The process disclosed by the invention is suitable for large-scale industrial production. The process has the advantages of low reduction temperature, mild and controllable reaction, thorough reduction, environment friendliness and the like, and is suitable for industrial production.

The invention provides a method for continuously manufacturing potassium diformate. The method is characterized in that carbon dioxide gas serves as a regulating agent, formic acid and potassium hydroxide serve as raw materials, potassium diformate is synthesized in one step, and no gas is emitted in the whole reaction process. In the production process, solid potassium hydroxide is prepared into a solution, a certain quantity of the potassium hydroxide solution is obtained, and the carbon dioxide gas is introduced into the potassium hydroxide solution to prepare a potassium hydroxide and potassium carbonate mixed solution; potassium ions and formic acid with the molar ratio of 1:(2.0-3.0) are added in the mixed solution, and stirring reaction is conducted; in the reaction process, reaction temperature is kept to be 55-75 DEG C; the carbon dioxide gas generated due to reaction of formic acid and the mixed solution is recycled and reacts with a newly introduced potassium hydroxide solution; the product of the primary reaction is taken out, secondary reaction continues, reaction temperature is kept to be 55-75 DEG C, and secondary reaction lasts for 1-2.5 hours. The whole reaction is mild, controllable and free of emission, continuous production is achieved, and the method is suitable for large-scale industrial production.

The invention discloses a grafting reaction device and a use method thereof. The grafting reaction device comprises a weightlessness feeding device, a single-screw melting device, an aid adding device, a twin-screw grafting reaction device and a vacuum devolatilization device. The use method comprises steps as follows: 1) a premix is added to the single-screw melting device by the weightlessness feeding device; 2) the single-screw melting device plasticizes and melts the premix into polymer melt and introduces the polymer melt into the twin-screw grafting reaction device; 3) the aid adding device adds aids to one or two heating zones of the twin-screw grafting reaction device; a graft polymer is formed through a grafting reaction in the twin-screw grafting reaction device and then introduced into the vacuum devolatilization device; 4) a solvent and non-reacted grafting aids are removed from the vacuum devolatilization device, and a finished product is obtained. The reaction device can effectively reduce crosslinked byproducts in the melting graft process of the polymer.

The present invention relates to a gas phase SO3 film-scraping sulfonating technology which belongs to the technical field of production technology which prepares anionic surfactant by using gas phase SO3 film-scraping sulfonating liquid organic materials. The invention is carried out according to the following steps: A: liquid SO3 is vaporized to gas phase SO3, the gas phase SO3 is sucked in a mixer shaft through a turbo-blower, the gas phase SO3 is mixed with inert gases recycled in a sulfonating reactor to reaction gas with the volume concentration being 0.1 to 10 percent, and then the reaction gas goes into a reaction cylinder body through reaction gas distribution holes on the upper part of the scraping plate shaft; B: the organic materials go into the sulfonating reactor and downwards flow along the inner wall of the reaction cylinder body, a scraping plate is rotated along with the mixer shaft under the action of a transmission system, the organic materials are continuously suffered with film scaping-spread coating-film scaping in the inner wall of the reaction cylinder body, the organic material are alternately updated and uniformly coated on the inner wall of the reaction cylinder body, and the organic materials are completely contacted and reacted with the reaction gas which goes from the reaction gas distribution holes to form reaction products. The design of the technology is reasonable, and the invention can be suitable for sulfonating or sulphating materials with various viscosities.